Religions are not revealed: they are evolved. If a religion were revealed by God, that religion would be perfect in whole and in part, and would be as perfect at the first moment of its revelation as after ten thousand years of practice. There has never been a religion which fulfills those conditions.
I cannot believe that any religion has been revealed to Man by God. Because a revealed religion would be perfect but no known religion is perfect; and because history and science show us that known religions have not been revealed but have been evolved from other traditions.